External-compression self-tightening chuck.



l. MCGREGOR, DECD..

M. mcenicon. Exacumx.

EXTERNAL COMPRESSION SELF TIGHTENING CHUCK.

` APPLICATION FiLED MAR. I5. 19H. 1 1 ,237,353. Patented Aug. 21,1917.

JQHN 11avom:een,.mscisi-issn;4 LATE orfsr; lionnynnw nniinswicn, CANADA, ,erk

" MARGARETMCGREeoR, vin rneu'rein,`or srjgroiin, NEW enUNswIcncANADA. I

" gEXTEBNALf-coiurnessioiv senr-:rienniviive entren.

ieee-535e.

To @Zlio/2.0mzt/may concern;

Be it known .that I, `MAR(mincir MCGrmidonE of'tlfiecityL of' St. John, in ythe countyof St. fi John, Provincer of New;Brunswiclnnnd I,the Dominion of Canada, ainthe executrix of JOHN McGinicon,` of the ,said cityof St.,`

John, who in his lifetime invented new and usefulln Improvements in IlXternahC/ompres sion "Self-'lightening Chucks, of whichthe following is a specification; l i a This invention relates to improvementsm chucks and the objects of the invention are to facilitate gripping the outer periphery of apiece offwork being turned and automatically self-center the sanieyto permit of the jawsfforming part of the chuck being simultaneously actuated, to resiliently con-` trolthe yreturn of the jaws to a normal kposition,` to simplify the chuck and render yit capable of being utilized on lathes `having-` either solid or hollow machine spindly and generally to adapt the several parts to better perform the functions required of them.

i l With these and other objects' in view, the invention consists essentially of the; im-

proved construction particularly described and set forth in the following specification and accompanying drawings formingpart of the same.

In the-drawings,

`Figure l is a longitudinal section of the improved chuck. o j o Fig. 2 is an end view of the same. l

Likek characters of reference refer to like parts in the several `figures.

Referring' to the drawings, A represents the y improved chuck comprising' tliebody portion l, formed` hollow and provided at one end with a radial flange 6,'having ori-V .iices7 therethrough to permit thek saidbody being secured to the face plate `of alathe. The body portion is providedon the in-` ner `wall rwith equidistantly spaced cam faces 8, designed `to coact with the adjusting'v V members ft, the outer face of which/is curvi` f' linear having substantially the samelradius l of curvature as the cam faces 8, the inner face of the adjusting member being,` substantially semi-circular as shown kat 10, and

adapted Ito engage with the semi-circular recesses 11, formed in the outer face ofthe jaws 3, which are slidably mounted in the slotsFlB` formed in the sleeve 2, which is rotatably mounted in the body 1. l

The inner face of the jaws 12 is provided `equidistantly v'orifices therethrough, jaws slidably mounted o a o f "Spcification ofteaerratent Y Patented Ang.` 21,1917.`

1 Applicationamarrar-@ii 151917:: serial 1\r0.`i55,129.` i f with serrations L'15 lformed with recesses 16,;,Wlth which the resilient rings 5 engage position; l f ,'lhetouterend ofthe sleeve is provided vwith avfplurality@ Qfradial; sections 17,

adapted to be engaged by a spanner and so ject or objects being held therein in a mannerto be made clear hereafter.

llVhen the chuck is in use, the work to be turned is located in the sleeve 14, which may then be given La turn by the hand causing jaws to avnorinally. extended `facilitate inlooseningthe Ajaws froini the obthe cam faces S to engage with the outer i face of the adjusting members 4, so displac-y ing the jaws 3` radially inwardly to engage Y the'p'iece of work and on starting' the inachine the resistance to cutting will tend Ato further tighten the chuck on the piece of work. y

`When the work has been completed and it is desired to remove the same from ythev chuck, itis only necessary to engage a span- `ner with the recess 17, when the sleeve 2 is 4rotated permitting the resilient rings 5 to engage the jaws 3 from the piece of work which is then manually or otherwise removed.

l i From this description it will be seen that he hasinvented a chuck which may be ad-` vantageously employed on munitions and the like and whereby the output of themachine: will be greatly increased since the time saved in automatically selfscenteringthe workwill greatly accelerate the output.

As many changs could be'inade in the above construction and many apparently widely different embodiments of his invention within the scope of the claims, constructed without departing from the spirit or scope thereof, vit is intended that all matter contained in the accompanying specificationand drawings shall be interpreted as yillustrative and not in a limited sense.

of equidistantly spaced cam faces in its inner wall, a sleeve rotatably mounted in the body having a plurality of notches in its outer end and provided with aplurality of spaced radially extending in the orifices provided on the outer end with a semi-circular recess, adjusting mem- .an outer wall formedwith the same radius bers having an inner wall semi-circular and ocurvature as the cam faces, adapted to f engage with thek jaws and cani faces respectively, and resilient means for retaining the jaws 1n a normally extending position.

2. In a chuck and in combination, a holportion provided with a 'plurality of equi- `distantly spaced and radially extending oriiices therethrough, jaws slidably engaging with the orifices provided on the inner vend with serrations andren the outer end with semi-circular'recesses, adjusting mem- Copies of this patent may be obtained for hers having the inner wall semi-circular and the outer wall formed` with the same radius of curvature as the cam faces and designed to engage with the jaws and cam faces respectively, and spring rings located in the inner end of the sleeve adapted to normally reta-inthe jaws in an extended position.

In testimony whereof I have signed at the town of: New Glasgow, Nova Scotia, this 4th day of June, A. D. 1917. l

yIn the presence of- JOHN BULL,

IRENE L. MARSHALL.

five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

